Browse Prior Art Database

Automated, Cam Inspection

IP.com Disclosure Number: IPCOM000044561D
Original Publication Date: 1984-Dec-01
Included in the Prior Art Database: 2005-Feb-06
Document File: 2 page(s) / 40K

Publishing Venue

IBM

Related People

Barr, ER: AUTHOR [+4]

Abstract

A cam is inspected to a precision of 0.5 micron by a cam follower to which a linear optical grating is attached. The position of dwells and ramps on the cam surface is measured relative to a reference position on the cam rather than to a reference point outside the cam. In Fig. 1, cam 10 to be inspected is mounted on a rotating table 12. The position of the surface of the cam is measured by cam follower 14 mounted on slider 16 which carries an optical linear grating 18. Slider 16 is spring-loaded towards cam 10 to keep cam follower 14 in contact with the cam surface. As the cam is rotated, sensor 20 senses the position of cam follower 14 from the optical grating. Optical sensor 22 senses the home position for the cam by detecting a mark on the side of rotary table 12.

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Automated, Cam Inspection

A cam is inspected to a precision of 0.5 micron by a cam follower to which a linear optical grating is attached. The position of dwells and ramps on the cam surface is measured relative to a reference position on the cam rather than to a reference point outside the cam. In Fig. 1, cam 10 to be inspected is mounted on a rotating table 12. The position of the surface of the cam is measured by cam follower 14 mounted on slider 16 which carries an optical linear grating 18. Slider 16 is spring-loaded towards cam 10 to keep cam follower 14 in contact with the cam surface. As the cam is rotated, sensor 20 senses the position of cam follower 14 from the optical grating. Optical sensor 22 senses the home position for the cam by detecting a mark on the side of rotary table 12. When sensor 22 detects a mark, cam 10 is located with cam follower 14 on the N = 0 dwell. Measurements from optical grating 18 are analyzed in a micro-computer relative to the position of a dwell at the mid-point of rotation of cam 10. The routine for analyzing dwell measurements of the cam is shown in Fig. 2. Fig. 3 shows the routine for analyzing measurements of the ramps between dwells. In Fig. 2, the routine starts by taking three measurements at the 0 dwell. Branch point checks to see if that is the last dwell. If not, the cam is rotated to the next dwell and three more measurements are taken. This continues until three measurements (M1, M2, M3) have been taken at each dwell and eight measurements have been taken at each ramp. All measurements are...